Ok, so i've just found and fixed the problem....Youre gonna like this. A couple of months back, i had new tyres all round and i had a guy in weymouth fit them (seemed like a nice enough chap), It turned out (after inspection 20 mins ago) that he failed to put back on my locking wheel nut!! So i've been driving back and forth to weymouth from wales with 4 nuts holding on my back wheel!! well done that man!!!
Lucky enough that there are some spare nuts with the spare wheel so i now have 5 nuts back on! My next question is, where can i get a locking wheel nut from?